PS402-01XX Datasheet, PDF (1/46 Pages) Microchip Technology – Single Chip Battery Manager - Nickel Chemistries

PS402-01XX
Single Chip Battery Manager - Nickel Chemistries
Features
• Single chip solution for rechargeable battery
management
• Embedded Microchip patented Accuron™
technology provides precise capacity reporting
(within 1%) for all rechargeable battery
chemistries
• User configurable and "learned" parameters
stored in on-chip 128 x 8 EEPROM; fully field
re-programmable via SMBus interface
• Integrating sigma-delta A/D converter accurately
measures:
- Current through sense resistor (15-bits)
- High voltage (18V) battery cells directly
connected to pack voltage input (11-bits)
- Temperature measurement from on-chip
sensor or optional external thermistor
(11-bits)
• Integrated precision silicon time base
• Eight individually programmable input/output pins
that can be assigned as
- Charge control I/O
- Safety function I/O
- SOC LED output drive pins
- General purpose I/O
• Full SMBus v1.1 2-wire host interface
• Microchip firmware in 12 Kbytes of customizable
on-chip OTP EPROM
Pin Description
VDDD
1
GPIO(4)
2
GPIO(5)
3
GPIO(6)
4
GPIO(7)
5
SMB-CLK
6
SMB-DTA
7
RSV5
8
RSV6
9
RSV7
10
VC(1)
11
VDDA
12
VSSA
13
RSHP
14
28
VSSD
27
GPIO(3)
26
GPIO(2)
25
GPIO(1)
24
GPIO(0)
23
RSV1
22
VPP
21
RSV2
20
RSV3
19
RSV4
18
ROSC
17
VREFT
16
VNTC
15
RSHN
28-pin SSOP Package (0.209 mil)
Pin Summary
Pin Name Type
Description
VDDD,
VSSD
Supply Digital supply voltage input,
ground
GPIO(0..7)
I/O Programmable digital I/O
SMB-CLK,
SMB-DTA
I/O SMBus Interface
VC(1)
I Pack voltage input
VDDA, VSSA
Supply
Voltage regulator output
(internally connected to
analog supply input);
ground
RSHP, RSHN I Current sense resistor input
VNTC
I External thermistor input
VREFT
O Thermistor reference
voltage
ROSC
I Internal oscillator bias
resistor
RSV1-7
I Reserved pins
VPP
I OTP programming voltage
 2003 Microchip Technology Inc.
DS21766A-page 1